b. 词组后接doing admit to prefer…to be used to lead to devote oneself to object to stick to be busy look forward to to为介词）

no good, no use, It's worth…, as well as, can't help, It's no use /good be tired of be fond of be capable of be afraid of be proud of think of / about hold off put off keep on insist on count on / upon set about be successful in good at take up give up burst out prevent … from…